Love the concept of this puzzle game and the ZX Spectrum aesthetic.
However:
• Puzzles are too easy to figure out
• To solve the problem without killing pupper, you need lighting-fast reflexes, i.e. start moving the cursor immediately when you (re)start the level
• Difficult to pull off perfect timing due to travel distance between R key and WASD
Overall, great game! You've got the basic mechanics covered. Just needs a quicker cursor (or mouse input) and trickier puzzles. Maybe E should be reset key to help players pull off perfect timing (considering a QWERTY keyboard).