7 Yr Old Phone vs Neon Blade Game deving

Hey guys, I've been building Neon Blade (fast neon endless arcade game) non-stop for 3 months on my 7 year old phone.

Now it's dying — super laggy and I can't work properly anymore.

Help me get a cheap laptop under $1k so I can finish the game

Thanks bros!

Here is the link to try out the game

neonbladeprototype.netlify.app