not bad
It was pretty fun until i got all the upgrades :(. But...you need to make more enemies come throughout the game, and maybe even make some new types of enemies. Also, the prices of upgrades should be higher.
Lastly, change some of the damage that weapons do. The hammer can kill everything in one hit and it has a huge splash damage area that you can drag around (which is kinda cool but shouldnt happen). Also, you still get money for killing enemies with the hammer, but you dont when you use the Hand. Wouldnt that mean the hammer is better than the hand (because they both give 1-hit kills)?
Fix these things and maybe bring that 7 to.....an 8. lol, or a 9, or maybe 10. :)