Spaceman is achieved at stage 111, not level 111 as the medal description incorrectly states.
Yes, in most games stage and level would be synonymous, but not in this game, where level is your MLG level, and stage is separate from that and is the highest ground you currently have unlocked.
And all this time I was overly-concentrating on my MLG level in hopes of building up to unlock that Spaceman medal when that wasn't needed at all. This is good because to get the MLG level to 111 would have taken many more days and/or weeks considering the exponential nature of building to each next level (plus I suspect it would have problems displaying the levels from 100 onwards)
One good thing about this game (since it otherwise definitely would suffer from the medals timeout API problem and likely not award especially the higher medals once achieved) is it does resubmit medals once you reload the page, so you shouldn't have that problem and likely will obtain your medals, so that's good.
3 stars because I consider this to be an average game, and though the medals resubmit functionality is a nice touch, it's not enough to push my rating higher. There's only so high a clicker-based game can rank in my book.