Bit5 file compressor (for MCU?)

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Hi everybody I'm a newbie here, and I'm not good at English at all, so I'm sorry for my grammar if it bother you

This is my file compressor, called Bit5. It's aim to use at least RAM possible (currently is 1280 bytes). It's compression is not so good :P

Please help me make it better

PS: Attach file have 2 versions, fast and normal, and their pre-compiled.

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Just a new version

57.2 MB (59,996,363 bytes) on enwik8
576 MB (604,163,628 bytes) on enwik9