So I oly joined the mm cult a couple weeks back, I've been totally hooked and had been buying he 69 quid diamonds to buy dinners with as found after about ten rooms you can't play for about 24 hours. I've discovered and I'm sorry if this is already known but thought it might help you, charge the golden rose collection which auto starts then run any other energy charm, copper Phoenix is given pretty freely or charging collections. Using both artefact and charm simultaneously means pretty much as soon as you exit a room your energy bar is fully restored. Ok so the Mathis....dinner is 60diamonds.....even if you don't have the roses needed for artefact and can't get them gifted, even buying all five is only 10 dia per rose five is 50 and artefact lasts 24 hours, you can use coins to buy phoenix and its a heck of a good way to keep level up. Since I found this yesterday I would have used min of three dinners with constant gameplay from say four pm til midnight or later, so I've spent nothing since and have increased three levels giving me even more energy top up. Silver and gold sun obviously last longer than copper Phoenix etc but just use what you have and each energy point increases by the half second I think, it took ten secs to recharge after exploring ocean room back to full, as I collected room drop items I was back to full.
Hope this helps
Hope this helps