Basic screen with game title, and string "push any key to start" is OK for the beginning. Anyway, the look of title screen is to be defined. Find some inspirations in other ZX spectrum games.

Currently player tiles data is kept in assembly file. It has to be converted to C data.

1. This way it might be possible to modify tile data in run-time (e.g. flip tiles, animate tank tracks).
2. If all project code is C then Makefile is simpler.

HP level, score, lives etc.
Can be at the bottom of the screen.

For example, if background grass tiles are 2 colors (green and yellow), when player tank is moving, it should update tiles around it to use only 1 color to avoid color clashing. Another example is moving bullet when if flies, e.g. above the water tiles.

Create "Makefile" instead of using bash script for building.

Some discussions on z88dk forum:
https://www.z88dk.org/forum/viewtopic.php?id=9407