Idle Slayer

The game is singleplayer, but you can pay to get bonuses that help you progress faster, which become especially tempting as progress can become very slow in the later game.

It's an idle game, and I've sunk many hours into building my character this far. I wouldn't say it has monetary value, but I would hate to lose it.

Daily quests expire if not completed that day.

The game lets you spend premium currency on temporary boosts, allowing you to shorten the time it takes to meet the next progress threshold.

It's an idle game. Enough said.

Gives you achievements for meeting various gameplay milestones, e.g. "collect 10 coins".

The aforementioned achievements.

The game gives you rewards and upgrades that feel like real progress, despite the fact that gameplay is open-ended and endless. You're progressing toward nothing.

Hitting bonus boxes gets you a random reward, usually either coins or a powerup.

The game drip-feeds you a small amount of free premium currency. However, it's not enough to buy any meaningful upgrades, so you are forced to either "waste" it on one-time boosts, or buy more so you can get a permanent upgrade.