I love it! You're really showing the potential of an action tower defence with both the bombs, and the powerups. The wrench is a great addition that adds a lot of potential to some underused towers, while simultaneously giving you a way to escape from certain doom. the new enemies are extremely unique and full of personality (though, I feel like the first couple of waves could use some more diversity).
Though the money system is still flawed, it is more than made up for by the number of new features that diversity each playthrough. Outstanding work!