RPCEmu on Win10 (recompiler) - RiscOS 3.71 on StrongARM with 128MB of RAM, 2MB VRAM
Arculator 2.0 - RiscOS 3.10 emulating Acorn A3000 with 1MB RAM
Acorn A3000 - RiscOS 3.10 with 2MB RAM

Menu controls:

-Space Bar: Skip intro screen/music

Mission 1:

Left Arrow: Left
Right Arrow: Right
Space Bar: Fire phasers
Q: Skip mission (CHEAT)
S: Skip to end sequence with tractor beam (CHEAT)

Mission 2:

Up Arrow: Walk up
Down Arrow: Walk down
Left Arrow: Walk left
Right Arrow: Walk right

Disclaimers:

This was written as a learning exercise - any or all of this could have been implemented the wrong way.

Any Star Trek trademarks, copyrights and intellectual property belongs to ViacomCBS Inc, or their respective owners. No profit is being made from this game, nor does it have any commercial associations, nor is it any good..

Known bugs:

Flashing cursor in top left
Sub-optimal sprites (squished rather than re-drawn as mode 15) plasma1-2 explode_ship1-4 tng_te tng_st photon1-2 durno_ship durno_ship2