I think it might be helpful if you provided your intended parses in the comments here, as I may be way off. Here's what I think:
1A: [-mine]CRAFT? First off, I'm not sure what the definition is. CRAFT goes with [Build]; CRAFTED goes with [Built]. The surface evokes the game in which you build with blocks, but [headless] is (conventionally) a deletion of only a first letter. If this was the intended parse, I think you'd want something that indicates removing [mine] (but not in the same use as in the video game).
4A: I think this is some sort of cycling of poutine, but I'm not sure. Also, I don't think [Controlling] matches INPUT's part of speech.
5A: I don't know what this is referencing Does it have something to do with turning "staring" into STAIR?
1D: I think CRITS in the D&D or RPG sense maybe fits with [precise], but it's loose. Not sure how to anagram or extract that from [an acrid tsar], though.
2D: Is this meant to be a hidden? At any rate, the definition seems to be [a first draft], and if so, that should really be at the start or end of the clue. Also, if it is a hidden, the "s" in [Alps] is extraneous.
3D: Like my comment for 1A about [headless], [endless] generally means that you remove ONLY the last letter. Here you're taking [-ials]. Also, a TUTOR is singular, whereas the definition you have here [proper teachers] is plural. (Also, I don't see what "proper" has to do with this.)
Sorry if that seems like a lot; I'm just trying to be helpful with the feedback and to better understand your cluing sensibilities. :)
Thanks for playing! I'll confess I'm not overly familiar with cryptics, so this puzzle was developed from a combination of the primer on the homepage and playing a few puzzles in an attempt to get the vibe. If I messed up a few of the conventions, that's a mistake on my part - I'm happy to learn more!
Anyway, I'll write my process below; feel free to give any other tips you might have.
1A: You're exactly right on the intent for this one; "Substitute 'Minecraft', take off the beginning." Wasn't sure if the 'headless' clue was specifically the first letter or from the beginning in general, hence the confusion.
4A: Intent was "sounds like 'poutine', reverse the syllables." As for the part of speech, wasn't entirely sure if those needed to match up since the clue is designed to be a bit riddle-like; I'll pay closer attention to that in future puzzles.
5A: "The infinite castle" was intended to reference a famous staircase in Super Mario 64, which loops endlessly unless you meet specific requirements. Also, you're entirely correct in that the intended substitution was "sounds like 'stare'".
1D: "Crits" is short/slang for "critical hits", which typically represent attacks that hit precise points on the body and deal large amounts of damage as a result. "Deposed" was intended to mark a deletion.
2D: This was originally intended to be a hidden, but I couldn't think of a great combination of words that didn't make it immediately obvious. I tried using "scattered" to mark that "it's a hidden, but not quite"
3D: See 1A; I wasn't sure if "endless" as a key was always one letter or could include more. Also ran into the issue of "it's a riddle, I don't know if I have to be dead-on with the 'real' clue or not" from 4A.
Very helpful to see what your thought process was, thanks! And yes, cryptics are hard to solve and harder still to write, a lot of conventions to follow. You are always free to break, bend, or stretch rules as far as you like, but the more you do, the more difficult it can be for someone to solve (or to fully, satisfyingly understand how they've solved it). I (and some others) stream cryptic solving sessions on Twitch, which can be helpful, so far as they show the thought process of constructors and solvers alike.
So far as hard and fast rules, either the start or end of a surface, with very limited exceptions, must be a crossword clue. All the conventions of writing a crossword clue apply, like matching the part of speech. Hydrologist Guy does a variation on this with riddle cryptics, but the definitions are still always crossword-legit. (It also means avoiding shared roots, like TUTORIAL and TUTOR.)
As for the rest of the clue, it's your call as to how to indicate the various shifts you've read about. For me, "scattered" doesn't quite mean "mostly hidden" in [Alps hamlet], and while I see what you mean, a good rule of thumb I learned from the Rackenfracker (https://therackenfracker.com/) is that precision goes a long way. If [headless] or [endless] can mean "delete any amount of the first or back part of the clue," you're asking a lot of the solver. If I want two-thirds of a clue, the ideal indicator specifies that.
I love the idea of video game cryptics, so I'm eager to see more :)
Anyway, I'll write my process below; feel free to give any other tips you might have.