If you have a decent Android flagship (Snapdragon 865 or better), you might want to try the instead of PPSSPP. The PS2 version of RE4 is visually superior and runs well on high-end phones. However, the file size is huge (2.5 GB compressed), which defeats the purpose of "highly compressed."
If you want to avoid the risk of malware associated with "Highly Compressed" downloads for Resident Evil 4 : Download Resident Evil 4 Ppsspp Highly Compressed