This game is awesome, especially the combos!
I personally prefer characters that can sprint/run. The newer characters only have dash moves, which don't feel quite as good as the earlier ones that could run.
As for the cheat mode, having health and energy infinite at the same time isn't ideal, plus you still have to charge energy to max before it stops decreasing. It would be much better if health and energy were separated into two independent toggles (Infinite Health / Infinite Energy) that players can turn on or off individually.
Overall, you can really tell how much effort went into this, and it's definitely worth supporting! Unfortunately, PayPal isn't available in our country, so I can only offer my support in spirit.