To everyone still trying for Dungeon Dash, I'd just like to say "Don't give up, you can do it!"
It's not so bad once you get the blocking rules down.
Siniri, I took to headbutting, or more often jumping ontop of with the shield, the ice creams too. It's really useful. I did some practicing last night just to see if I could beat it on a faster computer, and it was much harder but I could do it eventually.
Did you know it's possible to beat the first level with Abi by digging alone? lol Stupid and pointless, but amusing. Admittedly I had to jump for the shield when it turned up.
For people still stuck, here what worked for me (for fast computer):
-DOM level: Mouse on helmet space, keys for everything else. Don't forget you can dig through the blocks. Keep clicking on helmet once you get it.
-ICM: On the loading screen I switched to keyboard only. Like Siniri said, head but or shield attack the ice creams before they can hurt you. Sometimes it's safer to "kangaroo hop" through ice cream blobs with a helmet or shield on rather than roll through it and risk dying.
-SS: For the bad guys, either remember the color (orange helmet = orange kougra) or the letter ('S' for shield and skeith) and keep hitting the button for it until you are past. The bubble is your best friend otherwise. You can also use the shovel on the crates in a pinch but it works like in DOM where you still have to jump or shovel the rest of them.