Nice, but as mentioned before, a bit on the easy side. Didn't even need to upgrade health, and only got hit once due to not expecting the pattern from destroying the bombs from clouds.
Well, it's a good base. Definitely needs to get harder though, since the current level of difficulty makes the reflex system useless, only tested it once to see what it did, didn't need it after that.
Second phase is probably a bit too easy (only tested easy and medium, assuming hard is the same), you can stay in one spot and not get hit. It takes a bit of time though, but don't think any achievement or anything is time based (that counts towards you).
"Twenty-one" quest 2 says both that you need 17 exactly, and 17 or higher. Should only say 17, since it doesn't complete for getting 21 (got it twice in a row, the two times I've played, well on my way to that 1-in-a-trillion shot ;p)
Another update coming soon :)