constructive comment (i hope)
you guys ask for a constructive review so here it goes
for a first game let me say its awesome, as it has been said, the graphics look good, the gameplay is fun , with a decent difficulty, and good music.
now the critics:
-a bit too long, while it was fun, and it got me to be playing for a while, in the last levels i was geting bored at certain points, mainly because you keep doing the same, you could add something diferent about the enemies, a diferent way to attack them, or a little bit more of story, anything could help
-the upgrades where awesome, yes, but i would have liked to have more, the whole morph think had me really interested and curious, but wen i found out what it was, while fun, it was not exactly enough, maybe if you where to really morph into something else wen you get all the powers, dunno.
-the graphics, i have nearly no complain here, but a few things that are more related to gameplay than graphics, you could have added changes in the monster according to how you upgrade (like bigger mocus, or a bigger mouth, things like that) also some background change would be good too
-now my biggest complain, the ending, i was expecting a boss, more story, SOMETHING, but in the end it was just some stronger enemy, it was not exactly "rewarding", also after you figure out a decent strategy to beat the last guys they are pretty easy
-another problem was with the gameplay, while it was cool, wen you had to fight many enemies with the mocus it became a bit hard to handle it correctly, my hand would get tired and i would end up clicking outside the game, the aiming for the "canon" (cant remember the exact name now) took too much time in wich you usually got your ass kicked, but its a minor problem
still, the game is awesome, i specially love the style, though i would have loved to have some sort of "evolution" with the weapons (as i said, the monster growing, changing and stuff) , it was steall great you really deserve this 10, and i cant wait to your next game