Look: 8/10
What in the world is going on between levels lol 
And the levels themselves were quite interesting too, especially the graphics for when you got hurt (but that was hard to screenshot) 
Sound: 8/10
I liked the sound , and overall the sounds were great for the ZX series.
Play: 6/10
The controls were tight & responsive, and the gameplay quite straightforward once you knew what the heck was going on ha. The shooting aspect was actually quite fun, tho the letter retrieving/placing got old quite quickly.
Feel: 7/10
Oddly intriguing, but once you figure out what's going on, it's actually quite simple and straightforward heh. Avoid or kill the bugs (reload by getting the Data Kill again). And otherwise just focus on returning the letters to the right spots. Ez pz. Makes for a good time for the first 2 screens, but quickly gets old. Still, impressive for a microcomputer game of this era--especially for the ZX series because I haven't been a huge fan of these computers except for their text adventures. This gets a slight boost just for its concept alone.
Attachment: 7/10
Cool, albeit silly, concept of debugging a BASIC program. Tho I don't see myself returning to this, the concept and tight execution are ones I wont forget. And I might show my brothers. Well, I definitely could see myself showing some of the graphics and sounds.
Completion: Completed the first 2 screens
Playtime: 15 mins