A promising game! But that Spectrum cursor layout, hmm. If an option to redefine keys isn't feasible at all, may I suggest an alternative .tap using O,P,Q,A,M,Z or O,P,Q,A,M,Space ?
Or, for two-player keyboard, it could be something like W,E,Q,A,Z,S for P1 and O,P,I,K,M,L or something similar (see the pattern for finger positions on all layouts I proposed ?).
Thanks for considering!