I completed level 7 (progress bar is at maximum). There's nothing left on the screen, but the game is not progressing... I had to save and quit and lost the stars...
Bug: one opponent's health dropped below zero (negative figures). Attacks had no effects: I had to wait for its health to replenish and reached zero again to hit and kill it...
Is it even possible to make it to level 4???
I would suggest adding the possibility to skip the current block (put it in reserve or something) in order to make sure you have the crucial block when needed...
It's quite possible! People have been getting to levels over 20, don't ask me how they did that though. But there should be no problem getting past level 3. ;) Just remember that blowing stuff up is not always good, and focus on clearing out the highest stacks first. Btw, you can discard blocks if you want to. Just place them safely somewhere, maybe even prepare the next layer in advance with them?
The amounts of cash provided as rewards are ridiculous with regards to the money spent on getting the upgrades/locations/etc. unlocking the rewards. I mean, you spend hours to get several thousands of $ and purchase stuff to obtain... 20$...??? WTF
 "Flaming Zombooka 3 : Carnival"){kind=icon}
 "Mushroom Madness 3"){kind=icon}
 "Flagstaff: Chapter Two"){kind=icon}
 "Monster Arena"){kind=icon}
 "Crunchball 3000"){kind=icon}
 "Realm of the Mad God"){kind=icon}
 "XenoSquad"){kind=icon}
 "The Legend of the Golden Robot"){kind=icon}
 "SIN CAR"){kind=icon}
 "Concerned Joe"){kind=icon}
 "Kit and the Octopod"){kind=icon}
 "Cardinal Quest"){kind=icon}
 "Orbical"){kind=icon}
 "Pingy the Ping Idle RPG"){kind=icon}
 "Coinbox Hero"){kind=icon}
 "Feed Us"){kind=icon}
 "Chibi Knight"){kind=icon}
 "6 Differences"){kind=icon}
 "Steamlands"){kind=icon}
you can... you just have to figure out how :)