Try this idle battle simulator, Infinite Battle 5! Just leave it running while you're playing WarLight and you'll level up* in no time!

http://gamejolt.com/games/rpg/infinite-battle-5/33794/



*Disclaimer: leveling up does not apply to Warlight levels.

Reminds me of a very basic game called 'Cave of Doom' or something like that. Horrifically pixelated, yet fun.

I'm not sure of which game you're calling fun, but if it's mine, then thanks!