good game, but needs some improvements:
1. the last boss has too much hp
2. the waves are too long. 1min or 90sec is enough.
3. more items or research. i had over 40k money left at the last.
an easy way to avoid the laser is to stay behind him (if he shoots from left to right then stay on the left side).
the game is not too hard and not too easy...4/5
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