Funny Hell 

Funny Hell is a nice game in which you have to complete missions using funny monsters called demons that you have at your disposal. You will face different missions, such as destroying an enemy monument, protecting yours, killing certain enemies, etc.; and you will have to evaluate the mission and decide which demons you would like to deploy. Once you complete a mission, you proceed to the next one. You get money for things you destroy or by killing enemies, but building demons also costs you money. All the demons have certain powers, so you should use the ones that best suit your needs.

As you advance in the game, you will unlock other demons and other power-ups that you must use to complete your missions. The most powerful demons cost you more money. The game has very colorful graphics (although the overall presentation does betray that this game was first intended for mobile devices), nice sounds, and fitting music. Sadly, it only has one mode. There are five worlds with 10 missions each.

In short, if you are looking for a simple but enjoyable game to pass the time, Funny Hell may work for you.