I found myself playing longer than first expected. The weapons are varied and the dual energy systems allow you to explore different playstyles, even though it seems like certain weapons work better in certain sweet spots (high/low red, or low blue etc). Tons of fun just exploring how each weapon react with different upgrades. It's cool there are actual choices between weapon upgrades and healing up - so if I play better I also can afford to become stronger. If I need it but don't pick health, it's a gamble on my life. Very tense!
Sadly I never made it past the boss, but this is very well done, and feels like a strong prototype for even a commercial game. Excellent use of simplistic shapes and effects, and great fitting music. Well done!