Wood-Chopping Cat Raising Game

It's a simple game where you automatically hit trees with guns, similar to an ad format. You clear the forest, and at the end, a large tree appears, which is the boss. You have to beat it to proceed to the next stage. As with most idle/raising games, you have to watch ads for the ×2 bonus, but ads still appear even if you don't take the bonus. It's fine if you just leave it on without thinking, but at some point, progress gets blocked, and leveling up isn't as effective as you'd expect. The places to get gems are limited early on, so it's hard to get that dopamine rush; you'll probably just have to let it sit idle? Once you get a weapon, it's D-class, but there are many types up to X-class or higher. You can synthesize two of them, but it seems to be random rather than upgrading to a specific gun. Also, the paid items are separate: ad removal, buffs, and 1 diamond/m, each costing over 10,000 won, so it's a bit awkward to buy everything. The cats are cute, and there are many costumes, so it might be okay for those who want to play passively / don't mind watching ads?..