Very good, much more understandable than other escape games, I actually understood why things happened. Putting the battery in could be improved though.
If anybody needs an idea on a mega tower, try: 1 Sniper tower (fully upgraded normal) 1 Splash tower (normal -> splash) 1 Fire rate tower (damage -> fire rate) and 1 Area Burst (area burst -> area burst)
REALLY nice game.. So many more possibilities you need to exploit though! Think about trap doors, teleporters, clones... This game needs more work, but I really want to see V2!!
For anyone stuck on certain achievements try:
Front wheelie challenges - Mr F
Rear wheelie challenges - Spoke
Somersault/Boost challenges - Farty Pants