Congratulations on making this game !
I've played your game during a live that you can watch here :
I hope the feedback and live reactions will be useful to you. Keep it up !
A or left-arrow: move cannon to the LEFT
D or right-arrow: move cannon to the RIGHT
SPACE or ENTER: place towers at level up
ROBOT·DEFEND·HOME is a tower defense. Destroying the enemies give you experience that increase your level and then you can get more towers. Each tower has different status and a random skill (from a poll of 20 skills), so choose carefully and see until where you survive.
At the level up screen, don't forget to read the effects for the skills: