Learn Spanish (Latin America): Comemos aquí porque la comida es mejor.

Yes! They look very similar but have a small difference in how they are written. Porque (one word, no accent mark) means "because", like in this sentence. But por qué (two words, with an accent mark on the e) means "why", which you use when asking a question.

Why is the word for "we" missing before comemos?

In Spanish, you can usually drop subject pronouns like nosotros (we) because the verb ending already tells you who is doing the action. The -emos ending in comemos can only mean "we eat". You could say Nosotros comemos aquí, but leaving it out is much more natural.

Why do we use es instead of está when talking about the food here?

We use es (from the verb ser) because we are talking about a general, lasting characteristic of the food at this restaurant. The food being good is just how this restaurant is. If we were talking about a temporary condition, like saying the food is too hot right now, we would use está (from the verb estar).

Can I say más buena (more good) instead of mejor?