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I can't start it. it says that "DreamIsland CreateProcess() returns 2"

Not sure what was going on there but if you re-download the latest build it should be fixed. Let me know if your still having the issue.

So, now it starts, but my computer is not very strong. so it lags a lot (also got a problem when the sound of a car screeching to a halt kept going unless I stopped playing)

Should I try with the 32 bit version if it runs better?

I don't think the 32 bit version would make a huge difference. It requires a fairly modern graphics card to run well. I didn't spend much time on optimization given the scope of the Jam.