The instructions say "Each element has a unique energy requirement." but Shadow and Light are listed as having identical energy requirements. I suggest you delete the quoted line from the instructions unless you have a solution in mind, too clever for me, that relies on it's truth in which case please make it true.

Comparing floating point by adding an absolute epsilon to one side makes no sense at all.

If everything always have at most 1 decimal place, either represent it as int 10 times the actual value, or use Decimal. Deal with the floating point errors correctly.

tests are now wrong:

compound: FW ; energy: 25.0
needed: 25.0
expected:<false> but was:<true>

this should ofc be true!

And your internal solution is wrong too: you have to use >= not > (even if it's unlikely that it does a difference), and the test for negative values will not take into account the EPSILON, so this is not good too.