I must also commendably mention that you chose the ECBM mode for developing the game. For me, it is a masterpiece. The last game I know of that used ECBM was Robot Jet Action, released 3 years ago. There aren’t many C64 games that use this mode, so hats off!
Thank you so much for the information and the compliments!
When I returned to the C64 quite some years ago, one of my objectives was to make colorful hires games, so I chose ECBM for the platform part of the first QUOD INIT EXIT (the sky, instead, is a hires bitmap). In this game, I "just" pushed things further ;)
By the way, I'm not a C64 historian, but I'm under the impression (and I stress that it's an impression, so I might well be wrong) that after the release of the first QUOD INIT EXIT the ECBM got more love than before by the C64 scene.