Nice game. A few points I'd like to put forward though. On some levels I kill the boss before I even see it which can be a bit of an anticlimax to a level so perhaps have it invincible and not fire for a few seconds until its fully on the screen? And the upgrades need some sort of balancing, like better skills cost more? It'd be nice if you could grey out the skills which are unavailble to you and when you buy a new skill keep the old ones highlighted too so you can see exactly what you bought? And a few other little bits but whatever. Have a think about it. Nice game anyway.
It crashed my browser and I lost my saves. This would have been ok if it happened just once but it happened twice and I had most of the upgrades on the 2nd time it crashed. V disappointing :( was enjoying the game but I cba to go through all that for a 3rd time just for it to crash again