The game contains only 3 levels but I don't think that's the issue. Graphics, music, gameplay and level design are all amazing. The ads can be a bit irritating however this is an offline game so you can just turn them off. If you're familiar with Geometry Dash you should give it a try since you can grab a few cool icons to use in the full version of Geometry Dash, but if you're not familiar with GD I suggest playing "Geometry Dash: World" first before trying meltdown.

Can someone recommend me offline shooting games for android

This is really trash, the graphics trash also, it's worse than Free Fire Max, Warzone and Call of Duty: Modern Warfare III, no ADS, no control stick, no battle royale and no fucking gunsmith???? Why tf Nexon don't put The Finals's graphics and add some boys characters?? Haiyaaa! This is nothing but a disappointment!