Gameplay is fun and has some good variance when you get upgrades. I liked the bits of lore in each level.

Presentation seems relatively simplistic, although the black pillars/walls and field of vision effects are well done and help sell the aesthetic. The music rocks too!

For improvements, a map you can pull up would be nice, and some visual feedback for when you or enemies take damage would improve the game; sometimes it could be hard to tell when enemies were hit by my attacks.

Solid submission. Well done!

Note to self: Avoid the Cactus

Great fun once you get the right upgrades to play the way you want to play! Nice clean implementation of the theme with the upgrades changing your appearance, too. Killed a few more scientists than I should have, but had a great time with this one.