To handle revenge waves easily, just use Comet on the first revenge wave right as it comes out, and have your units keep attacking. Once the second horn blows, use Phoenix Strike then immediately cast Ice Storm and Healing Potion. As the fourth horn blows, the Phoenix should blast by, destroying the enemy waves and letting you kill the castle. Sometimes this won't completely work and you'll have to retreat a little, though.
Not as good as the other games in the series. Those were puzzles that could be solved by simply thinking. These have too much trial and error, and many things are far too unintuitive. 3/5.
This is awesome. It took me a lot of tries to get gold medals on all the levels, but being able to crash my computer in the reaction chamber is worth it. 5/5
The revenge waves piss me off, as they're far too large. I'll get the enemy castle down to 500 hp, then spend the next 10 minutes trying to destroy a revenge wave.