Steel Seraph has been updated to 1.5.0, and is now on Linux.
Changes:
+ Districts 11/12/13 are smaller (5x5 screens instead of 10x10).
+ Minimap is added to ground stages:
Green- NPCs
Purple- Player
Red- Enemies
Blue- Bosses
Yellow- Equipment
+ Acts 3-B (X52I Omnistation) and 3-C (Nymph battle) added, thereby finishing act 3.
A Mac build is coming, TBA.