I like the game, but a bit buggy at the moment. In level 5, the boss monster keeps entering the scene over and over again, making me earn loads of money. I think I'll sit and wait for a while so I can upgrade all soon to be ghost towers ;)
The game has potential, but needs a bit of work. As many have pointed out, the font is way too small to read and where can I see exactly how much cash I have??