team razed must have had their reasons for using this color scheme. i think they're making it green = decreasing, but players can still play because it all depends on their luck.. and orange = increasing, but players should still be cautious and gamble responsibly. that's just my personal opinion. but team razed also includes up and down symbols, so players shouldn't be confused by this.
Therefore it would be better for gamblers to stay realistic and play without pressure and not to focus too much on RTP alone. Because in my opinion there is no guarantee that a high RTP will always provide a win. Luck-based games even at low RTP if you are lucky you still get a win.