The game had a good game loop. I had upgraded my character to level 2 and it's good that you have made a somewhat complete game that can be played again and again in just a single day. But there are still some features that can make the game much easier to play!
- A meter for when the stealth mode ends. I am often returning to my 'grave' and my stealth mod finishes mid way and the guard catches me.
- A meter for when you can use the stealth mode.
- A health meter for the player so that you don't die instantly by the guard, and it can also be influenced by character level.
- Having the ability to capture guards' souls too, just because guards are not 'soulless'
- Graphics for a road where we walk, just so that the background matches the playing environment.
- Having the ability to strafe above and below; guards have this ability, it will be wonderful if the player gains the same ability too!
I also found some bugs. Like the music just stopping when you capture a soul, some text display issues when you upgrade the character, and the "R" key message cloud that appears on some child just staying there even when the child runs away.
I'd also suggest just removing the first 5 second cooldown the first time you start a level. I can't understand why this cooldown exists. I think either it should be added every time you want to capture a soul or it should be completely removed.
Otherwise the core game loop is solid. It is good progress for a single-day project.