How do you get the "Kill an apparition on field M7, N2, F6" achievements. I've replayed them a bunch of times but no apparition appears.

so I have 166 explored fields, got the Gem of Eternity, there is one map with no fields under the map "R" (a map with a big mountain).... but there is no field I can play. is this the end of the game or what? how should I continue? do I have replay all the fields on higher difficulty than Looming? I did not solve the compas puzzle yet, is it necesarry to end the game?...

Why's it pink/white instead of red/orange? can't work out how to add a pic :-/

Only two out of the five games I believe are released on Steam is there any reason why the others were not added?

I have unlocked the Amp skill, but I still dont get the mechanics behind them. what is the use of upgrading gems in Amps, when I can get higher damage by upgrading a gem in the tower? or am I just missing something?