The game feels original, the wyvern thing it sells on is pretty rad.
Biggest problem I've had is that you kinda hit 0 HP before you even realize you've been taking much damage, and the upgrades don't really feel rewarding when they're just +1% of this or that.
The text skip on the intro is a bit fast if you're just tapping through it to read it faster but it's a good feature and good practice. Maybe make the skip speed accelerate over a second or two as you hold it down.