Why do you need help? You asked "what is this game engine", then posted a link to the game engine...
Infinity xos
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I'll be sure to checkout the pixel art (It is more what I'm looking for). Though you never stated how you wish to be paid like up front, equity, etc. If you wish to look at our instagram Infinity_Xos I believe the second one back is what I wanted help on. I never could draw people well. (The third one back was my original sprite idea but I used so few pixels vs what I used on the world it looked bad.)
I don't think that forcing players to spend in-game points to save is a good idea. The only way for that to work without being frustrating would be making points easy to get, or making saving not cost much at all. Though then it would be pretty much useless to have it in the first place.
Lets use an example if they make dark souls 4(I don't think dark souls 4 exists yet), and have this feature. The game by itself is rather unforgiving and it's easy to lose souls as it is, but to top it off you pay like 2,500souls to save? It would make the game not even worth playing. Plus if you die, and have to go back like three hours because you didn't want to pay all the points you just got. Well that would be no fun at all!
Unity personal edition is free, interested? Yes, and I only know what tennis is. So you choose & I'll look into your choice. You can look into other contact info here: http://aiplexprogramming.weebly.com
What a Game is very simple avoid crashing into objects to survive and get a higher score.
here is the link:
https://aiplexprogramming.itch.io/what-a-game