Solid unit.

The part with a lot of mutants can be done better with the current strat, or maybe even with a BFG strat so you press the switches faster and return to the hatch faster. The mini boss kinda likes to get stuck when you throw a couple of Teslas below him which makes it easier to hit him. The low gravity section is decent but I feel like there can be some crazy rocket boosting done there or something. The boss fight was OK but can also be done better.