I'm sorry for being desperate but this game is really unique - I will try to paint a picture albeit a hazy one. I've found this game over a few months ago, I played it and it was pretty fun. The character, you, is a pixelated grim reaper in a bright purple robe. You place towers in the appearance of eyes, teeth, a heart and more. It's almost roguelike but the towers you place from collecting souls of enemies attack for you whole you evade attacks and upgrade your towers to survive waves.

The background is grass with a moody mildly dark green. I also remember it being an HTML5 game but perhaps Unity.

That's all, if you've heard of this game please let me know - Zeke.