the Level music is very calm and moody. Befitting a tower defense game.
Not sure in what context lumber march would be in, but it definitely sounds goofy-spooky to me.
The success sound doesn't sound very successful to me.
The tiny trumpet in the Charge sound effect was funny and just made me think of a horde of tiny lemmings charging. Not exactly undead folk though.
The RiseUndead was good, but I feel like the evil laughter was a bit off. I would have just put a shy whisper on there instead.
The lose sound definitely sounds like you lost, but a little too discombobulated and quirky for my taste.
In conclusion, a solid entry.