I thought this was a really neat gameplay concept! I'm not sure if it could be used in a good good game but even as it stands here it's pretty good. The only thing that really bummed me out was the lack of a victory condition.
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Actually you win if you protect heaven for eternity (Literally!). I mean you lose if hell takes over heaven and you win, if you don't let that happen ;)
Yes, it's impossible to win this game without time stone, and you can't withstand the forces of hell. You're not doom guy, right?
BTW, I'm glad you liked it :)