Fun little game! Great job!

I nearly missed the upgrade you could purchase because you need to leave the level select screen so it is very easy to overlook.

I also could not unlock the jetpack because I could not get extra items with the grappling hook. I think I am supposed to use it at the beginning of the third level but Its reach also too limited or I couldn't get the timing right with the double jump.

But overall this is a cool game with some nice peaks of difficulty and replaying with the upgrade feel nice/easier each time

The use of the theme is a little bit of a stretch for me. "Scale the mountain" could just as easily be "Climb the mountain" and "Scale your character" is just upgrades or equipment. The level design isn't very engaging, the best option usually is to sit on the level of platforms below and jump/shoot so as to stay away from enemy bullets safely, which gets old pretty soon. Platforming isn't great, I personally am not a fan of the jump and switch directions in midair to progress. The art is really really cool!

Fun! Good idea and story. I like the artwork as well.