So I played this map with 2 people last night (we were bored), and while we were excited to try out a new mvm map (it's always a miracle occasion to see a new mvm map)... in 30 seconds we were disappointed already.
To be more explicit:
+ The moving platform was pretty cool, although I don't know how it would react if giants were pushed down there.
- The map was way too small. Ridiculously small. The maze-like feature was okay, but you should expand on that more and make the map bigger. It would add an interesting twist. Right now, the time to walk along the bot's paths from bomb hole to spawn is like 20 seconds.
- The bots need to come out of some tunnel or some building or some exit (like bigrock or mannworks), not from white void space. The tank also awkwardly just appeared right in front of the second spawn, rather than spawning deeper inside the spawn and slowly crawling out.
- The pop file was just... outright bad. The first wave was laughable (engineers and backscratcher pyros). The giant gauntlets got stuck in spawn and couldn't escape (only after sending rcon commands to the server console did they start budging - make them smaller, or make the ceiling taller).
You should avoid making spies part of the main wave. We had an issue where the spies just sat while disguised at the bot spawn, and the wave couldn't proceed without them being killed. Eventually they moved out of there and moved elsewhere, but it still wasted our time nonetheless.
The 100 scout wave only spawned 2 scouts every 5 seconds or so, and was extremely boring. Coupled with other wavespawns this can be an OK setup, but just a wavespawn of scouts with 2 spawning every few seconds bored everyone. We skipped that wave out of boredom.
The last wave we did with "nobody leaves the bomb hole" mode, and we destroyed the tank and the giant soldier at the last minute.
Overall the pop file is mindbogglingly easy, and while it is a good idea to make a normal mode mission (since most people only do normal mode), this was 10x easier than a valve normal mode mission. Each wave also was very short. Bear in mind, we did this with only 3 people, so with a full team this would be extremely boring. Being easy isn't a bad thing, but being boring is a bad thing.
* If you are going to keep the moving platform thing, the bomb needs to reset (which it does, so keep it that way), or else the team needs to just knock the bomb under the platform and they win. Even with that being said, it's still an "exploit" more or less, since bots always chase the bomb, and once they go in there they can't jump out.
My two cents.