Some really cool and creative platforming mechanics !
I really enjoyed what you did there with the recoil mechanics and that upgrade to introduce a 3 jump combo is really satisfying to pull off, and the reload/retrieve of the"Last Bullet"upgrade is quite well done and i like how when it falls in an accessible place you can just walk overit to pick it back up instead of using the retrieve function.
I'd say here the controls are just a bit setback by the keyboard only mapping where it gets a bit cramped aiming down moving alternating between the 2 shots, some other issue i had was that sometimes after dying you respawn right in an enemy and lose health instantly :/
But other than these the game's pretty good, i really like the overall aesthetic with the vector art reminding me of good old flash games from the Newgrounds era ^^ and your character and enemy designs are really cool too, those Iron maiden/sarchophagus type enemies really made me think of something out of some Voivod album cover art so really awesome :o
And gameplay wise i really like how impactful the shotgun feels.
So congrats, you guys did a really good job :)