Is this mod compatible with Space Age/xxxx?

Currently it is not very compatible with Space Age. You can try but there will be duplicate items (e.g. calcite and ammonia).

If it is another overhaul mod, then it is probably not compatible. Currently there are no plans to make this mod compatible to other major overhauls.

If it is another non-overhaul mod that changes content, sorry I do not know. I recommend trying yourself and then tell me in discussion, if you really want the compatibility

If it is an utility mod (e.g. creative mode, helmod), then it should probably work. The rest is same as above.

Will this mod be open-source?

Yes, eventually.

Currently the Github link is private and removed because my code is still not polished enough and there are LOTS of contents that I have planned and still not implemented.

Once the mod is at a complete state (i.e. with complete gameplay till rocket), then it will be public. It is more than welcome to submit pull requests or fork it, as long as you followed the licenses.

Some of the item/fluid graphics are confusing!

Yes, I understand this possible issue even before the start of development.

Compared to molecule icons and colored fluid, I have considered using the Angel-like colored icon system, but considering the number of fluids already in and will be added, I decided to stick the current design.

As an attempt to solve this issue, I already employed multiple strategies:
- Sub-icon for some of the fluids and recipes (e.g. plate from different source, slurry)
- Similar looking molecules are rotated differently (e.g. Hydrochloric acid (HCl) and Hydrofluoric acid (HF))

Please report to me in discussion if there are icons that are very confusing to a point that it heavily affects your experience.