It's called SnowRSPS Mini. Fight waves, beat a boss every 5 waves, pick blessings, and push to the Frozen Peak where the Snow King lives. When you die you keep your talents and collection log, so the next run goes further.

No download, no sign-up. It's a side project next to a bigger game I've run for years.

Honest feedback welcome, even if it's "this got boring at wave 8".