If you're having trouble with the final boss, trying the Warder tree. You can make it a long but easy fight just by outrunning him and throwing Scorpion Bite every 15 seconds. Or learn Nature's Grasp to take as many shots as you like as he limps across the field.
The ability to recover health is either non-existent or bugged, so the game is impossible to complete unless you can avoid all combat (or randomly avoid whatever keeps you from getting health).
Amusing, but some aces require pixel-perfect placement. That's not fun or skill at that point, just trying to find the exact pixel that gets the right bounce.
Lava pits?
This might be amusing for a little while without the badges and achievements encouraging people to grind and slam their heads against walls.
It's unfair to the game to give it the 3-day badge. That makes you repeat Day One dozens of times until you get a good one (without a completely horrible Day Two). Don't make the players hate what is otherwise a fun and cute little game.
Where do you live that it is common or even sane to see traffic lights that only face one direction of travel, scattered lanes with no lights at all, or lights out of sight distance from the intersection?
Doesn't succeed at all in the flash window, neither the horizontal scrolling nor the vertical nothing. Can't say if it would be much better without that problem.
Recommendations:
1. Autofire. If there is no reason ever not to be shooting, I should always be shooting, without holding down the spacebar.
2. That thing where the enemies are still shooting while you are dead, so you rez surrounded by bullets? That's bad.
Adventure level 4 is horrible. First there is the design decision to put successive keys at opposite ends of the map. Then you must be level 6 to exit, but there is not enough xp in the adventure game to be level 6 by the end of the 4th map. You must repeat the map several times or play the arcade mode. That is worth mentioning before sending someone back and forth across that map.