Love and Space. Combined.

It was pretty decent. It becomes very fast paced.

However, there's a few things you might want to fix.

There isn't a guide to the buy system...I had to guess that the health and money towers gave you health and money when you were standing near them or something...and I couldn't quite work out exactly what the rocket ship did.

The turrets can only be pointed in one direction, and the right-click open menu option doesn't work unless your mouse is in the right position (i think it has to be a certain height above the ground)
As Nik said, the curser was a little hard to see. Also, the rocket launcher seems quite overpowered: due to the lingering blast and large radius, one could simply spam it at their feet and you'd be invincible, as long as you avoided falling enemies.

Apart from those things, I enjoyed playing this cutesy game :3

I can see this turning into a really good game when it's done. I really enjoyed playing this. I had a problem seeing where the cursor was sometimes - maybe changing the colour to something that is more stand out (e.g. black)?

By screenshots alone, this is very pretty. :)