Sounds like you have some goals in mind. Just keep working at it and add more variety and content. Turrets that do splash damage, a slow loading rocket that can hit anywhere, chain lightning, poison pools are some ideas that other TD games have done. Maybe some upgrades to the mouse click when you're bored waiting for upgrades to cash in on. I like the ideas of having other layouts, or making your own, and to give the turrets some basic AI ie prioritize strong, weak, first, last, close, etc. Keep up the good work, its a fun "leave on while I'm at work" game.
I agree with the other comments. There's a great variety of tutorial levels, but nothing that too difficult. Many levels can be solved with some trial and error. Very clever concept, with more mechanics and more levels you'd have a real gem here. Looking forward to more levels or a sequel.
I noticed that if you knock someone out, then pause the game - even though the timer stays paused - the knocked out person still comes back into consciousness after a bit of time. I've resetted many a game due to this. Still a great game though, love the electrical box and lockpick minigames.
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Thanks, we have catch it too already. Will be fixed soon.