Just realised I’ve probably bought that app at some point - no idea what it costs since Google doesn’t show that information once you own it.
There’s a free version which likely has done restrictions but probably still does exactly what you require:
https://play.google.com/store/apps/details?id=com.gmail.anolivetree.imageshrinklite
Install Team Fortress 2
Get prawned like a noob repeatedly
Get good
Prawn noobs repeatedly
I’m somewhere between steps 2 and 3 myself after around 2500 hours or so of gameplay.