sedward5's comment is full of lies. There are indeed 4 levels, but after that the game ends and there's nothing else to do. There are no power-ups, no cutscenes, no extra game modes, no multiplayer. And this game can't crash your browser no matter what...
Sorry toto for the delay in response.
You must have not played the game through to completion. The game will absolutely crash your game if you spend enough time playing it.
"4 New Tower Types: Beam, Poison, Self-Destruct, and Confusion. Each of these towers can be included to make Mega Towers"
You can't make Mega towers with Suicide towers though
How to progress faster :
Dart arms, laser core.
3-5 is the best place to grind. But don't finish the level, quit once you destroy the 3rd glass ring. Select 3-5 again, do the same thing than before. Repeat the cycle until you have enough cash for your needs
How to grind easier : do 3-5 until the third glass ring, quit the level, go back to 3-5 until that 3rd ring, rinse and repeat. You can get about 1200 blop cash per run.
No. Currently the only two keyboard layouts supported are QWERTY and QWERTZ (you can use Y for Basic Attack). But for AZERTY there's no support (and I currently have no plans to support it due to a lot of problems). You can, maybe, re-map your keyboard the hard way, or use your mouse to play in the Battle Arena.
My all-gold strategy :
boomerang>plasma>faster darts>double plasma>double boomerang>twin darts>quad darts>[...]>quad missiles>[...]>laser with darts>triple plasma>quad plasma>triple twin. You don't need to buy anything else.(If you are at world 4 and you miss the 3rd-4th plasma, go straight for triple twin and get plasma later.
It would be nice to be able to see the stuff I got from wasting my money on epic skills, something like a counter of how many times a skill has been triggered.
 "Petri-Dish Survival"){kind=icon}
 "Bubble Tanks TD 1.5"){kind=icon}
 "2048 Hell"){kind=icon}
 "Bloons Super Monkey 2"){kind=icon}
 "Anti-Idle: The Game"){kind=icon}
 "Bloons Super Monkey"){kind=icon}
Sorry toto for the delay in response. You must have not played the game through to completion. The game will absolutely crash your game if you spend enough time playing it.