I couldn't stay alive for more than 10 seconds. It felt like I had absolutely no way of knowing how "fast" or what angle I would fall out based on how long the charge was. I had no idea if I was 20% charged or 80% charged. Instant death meant no way for me to correct.
I think there's real potential here though! I would suggest to add a mini-golf or pool style targeting line showing the vector your about to launch at. just that change would improve the game ten fold, IMO.
I hope that didn't sound too harsh, well done on a slick entry!