I like the environment and the platforming a lot, at least until I got sfotlocked at the volcano since I got stuck on an island with a wall I couldn't jump over. Not entirely sure why the gun was there either, since I could reload it but not shoot it? I didn't come to this game through the game page so I might've been missing an input, but if that's the case then you should really consider making the input more intuitive for a first time player.
Good work overall though! Keep at it my dude