Fun but few updates

This game is really fun but, there are a few bugs. For example, when you upgrade the range for the surge tower, it cost much more power than it shows. And I mean MUCH more. The last upgrade costs like 19 power! No save function disappoints me. A sandbox mode with all the towers and infinite power would be great! Hopefully you will update this game more often.

Someboby that you dont know about Antivirus, v3.0