I like your game! I really like the ZX Spectrum classic effects, and the HUD was really nice to look at as well! It made me feel like I was actually piloting a mech. The environment design was cool as well. Even with the limited color palette and pixel sizes, the tiles were super well done, and they helped to create an eerie alien environment for the player to explore.
One thing I would say is that high jumping and heavy gravity are a bit disorienting, especially when paired with the slow walking speed, and it makes it difficult to aim at blocks that are difficult to reach otherwise. This isn't a game-breaking problem, but it's something that could help improve the game if you ever want to go back to it.
That aside, this is still a really fun game and solid entry, and it's really fun to explore! Great job!