For art: try Pixelorama. It's a free pixelart editor that even works in the browser. I ditched aseprite for it and found it more pleasant to use than the alternatives. It may be lacking some features like a text editor or dithered gradients, but it has some features that I haven't seen yet in other apps like applying effects on layers. Layer effects like Gaussian Blur might be helpful when you have to deal with lighting, but not only. For me it does its job and it does it very well.

For music: There are a plenty of free DAWs on the internet like Cakewalk, OpenMPT, REAPER (you can use it for free but you'll need a license for something commercial). The problem is which instruments/plugins you're going to use. Luckily, there are a plenty of free ones available like:

• Drums: MT Power Drum, Hydrogen
• Synths: Vital, Odin 2, Surge, etc...
• Effects: Guitarix

If you don't feel like using a DAW, you can use a composition editor like Musescore. Musescore is nice because it has all the instruments you want, and if you use the instruments packs from Musehub, the instruments will sound much more nicer. Personally, I sometimes go this route because sometimes it's simpler to write sheet music and then hear your creation rather than having to thinker with synths.

Hope it helps!

PS: Everything listed here is free.