Bootskell is one of 16 games (as of this writing) by Japanese developer Inufuto using their C like cross-platform engine (called "CATE"), targeted at many dozens of 8 bit systems. On systems that don't have hardware sprite chip or a dedicated background music chip (like the Coco's & MC-10), the engine uses tile based sprites, and single voice music in the intro, game end, and between screens. On the Coco 1/2 version, it runs in the equivalent of PMODE 3 (128x192x4), and on the Coco 3 version it runs at 256x192x16 (a narrower version of HSCREEN 2). The games are designed to run from cassette; this means that if you run the Coco 1/2 version from a disk drive or DSK image, you should use a Disk BASIC disabler routine (like ROML) so that the game doesn't occasionally crash or glitch some of the graphics. Or get the patched versions that available on the Color Computer Archive.
Bootskell is based on the arcade game Pengo, although it does have some differences. Using keyboard controls, the player moves around a maze of ice blocks, which can pushed by both the player and the monsters. If they are pushed directly into another ice block, it will get crushed and disappear. If there is a gap past the ice block in the direction it is being pushed, the the block will slide across until it hits something. If it hits the player or a monster, it kills them. There are other blocks that are not able to be pushed or destroyed in later levels.
It should be noted as well that you use the SPACEBAR to push a block and either I/J/K/M or the arrow keys to move your plane.
It should be mentioned the Inufuto has also released this game for the Coco's cousin, the MC-10. It requires a 16K RAM expander, and runs at a lower resolution (128x96x4), but play pretty well identically to the Coco versions.
Title: Bootskell
Author: ??? (Inufuto?)
Publisher: Inufuto
Released: November 7, 2021 (Coco 1/2 version), August 11, 2022 (Coco 3 version)
Requires: Color Computer 1 or 2, 32K RAM (Coco 1/2 version) OR Color Computer 3, 128K RAM (Coco 3 version)
Download any of tape version ports (for various systems including the Coco's and MC-10) of Bootskell here.