Played a few rounds and can agree this is a fun and addictive game style. Very similar to the Vampire Survivors style of game. With new additions like varying enemies, spell augments, etc. I can see this being a fun loop to get lost in.
However, like others have pointed out there are a few issues.
- The background felt pretty disorienting for a while, the only point of reference being the cursor back to the altar. I also couldn't tell if the stage was borderless or not.
- The controls get pretty clunky, especially once you stacked enough speed. The slower movement while moving backwards also took a bit of getting used to at first.
- Power scaling seems to take off pretty quickly. Stacking movement until you get enough HP regen to become unkillable seems to be the go to. I can see this getting fixed by scaling the upgrade costs or adding in new enemies with varying abilities.
Good work though. I would love to see what all you could add in if you continue this project!