First sticker, stick it to the area on the right. below cloud that does nothing but you have to click the hat and drag it to the bottom right... better tut pls. hope your future/ now games are better
Tip: make the upgrade char X lvls a increase decrease thing instead of button for each upgrade i.e. one arrow up button below the amount and below that arrow down. obvsly arrow up increase the amount to 1,10,25,50,100,1000 and arrow down decrease to next thingy. value button to show. That way you can have way more options than your 4 buttons you have atm like a max option
Might think about adding saving Hero layouts for the different maps and add a 10 sec timer to auto restart after death. In case it is the first time some one runs a map use the same layout as before. like spot1=Herobla.. spot2= Heroblub... to fill it up. add Idle vs remake option. like you can remake a layout if it used idle maybe limit to wave 1-5. would make the game idle and user friendly *shrug*
Re.hkerekes idea of skip lower levels. maybe add an option to buy an upgrade to skip lower lvls, targeting speed and maybe other stuff. but 2 things to start aint bad. like qol upgrade menu
 "Sticker idle"){kind=icon}
 "Tabletop idle"){kind=icon}
 "Idle Mons"){kind=icon}
 "Tap Knight"){kind=icon}
 "Time Clickers"){kind=icon}
 "Anti Terrorist Rush 2"){kind=icon}
 "Idle Hero Tower Defense"){kind=icon}
 "Idle Portal Guardian"){kind=icon}
https://www.kongregate.com/forums/1044304-idle-mons/topics/1822327-autoclickers