Very fun to play! I made it to wave 5 before getting totally annihilated.
Visually, it's awesome. I really dig the mech designs and the ability to choose which weapons you have in the loadout. The water effects are sick. It was good to have some enemy variation to fight. Having to choose the right weapon for the job (i.e. swarmers for airborne enemies and bazookas for water enemies) was great.
I thought the enemies were a bit small and really challenging to hit. I feel like I mostly hit them due to luck a lot of the time (or because the swarmers did all the work :P). Maybe changing the weapon to more AoE type attacks so you can focus on positioning in a way that clusters a bunch of enemies together before blasting them all? Or make them a bit bigger and a little slower moving so you can hit them with precision attacks more easily?
Obviously, some sound design would be great too, but overall, I got the feeling of speed and power due to the really high level of visual polish. Would love to see more of this. Awesome submission!