Energy system is still there for the "new" mode they introduced a few months ago, with the challenges, one weapon type per run, etc. But if you want to do classic monster dash where the background changes every 1000, weapons come in pickups, no daily bonuses, you can play that as much as you want.
Yeah but the guns are insanely expensive compared to what you get each run. Deleting this. Energy system ruins the game too. Tired of timers. So many good games coming out lately but all with timers/energy systems same thing and I usually delete them as I get tired of having to wait to play.