the graphics seem to be a hot button issue
it looks like the thing you worked on hardest was the terrain.
it worked in your favor, i think. that water effect was cool.
as far as the rest of your graphics go, the weapons were very colorful and flashy. neat! whatever else, i think you might have put more sounds into it.
i also liked how the rocks added to my strategy of taking down the boss.
maybe in the next one, add swappable body parts. like leg, chassis, arm.
and each having a number of weapon points (0 to 3, maybe.) and the ability to sell parts or weapons to afford new, more advanced ones.
i don't know how Mo feels about it but the addition of some music would be great. there must be some musicians who would lend you some.