-Hold to jump higher : i like this feature, however, i don't like the fact that it's totally up to me to chose a height, for example, in Super meat boy, when slightly touch the jump button, Meat Boy will do a satisfying jump, while on your game we barely leave the ground, i suggest you add a minimum jump and then keep adding force while the player is pressing (for a limit of course)
I would also like to say that you should work more on the enemies AI, specially that green giant, but i think it's too early for that. Also there is a very important thing, Level design, technically your game works right, or at least from the programming perspective and that is already an achievement, but many players doesn't care about that, so if your game isn't fun to play no one will come back again, i can't give any advice on level design since this a field that am struggling with too, but i can say that the first level need some adjustment specially for platforming, try to make use of the Dash or something, not just throw some platforms and tell us to jump :p
That's all i got for now, i hope i helped ^^
Good luck :)
alaslipknot
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Blog : alaslipknot.tumblr.com